Method for producing cis-(-)-flocino piperidol
The present invention provides a method in which when using (+)-dibenzoyl-D-tartaric acid to optically divide (±)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone, an ether-based solvent is added and an extremely high yield of (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone (+)-dibenzoyl-D-tartrate is thereby obtained, a slurry thereof is treated with a base, a “three-dimensionally bulky reducing agent” is subsequently used, and cis-(−)-flocinopiperidol is thereby produced with surprisingly high selectivity.
1. A manufacturing method of cis-(−)-flocinopiperidol represented by formula (I):
or a salt thereof or a solvate thereof, comprising the following steps:
(b) forming (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone (+)-dibenzoyl-D-tartrate represented by formula (5):
or a solvate thereof by:
(i) reacting (+)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone represented by formula (3):
or a salt thereof or a solvate thereof with (+)-dibenzoyl-D-tartrate represented by formula (4):
or a salt thereof or a solvate thereof in a reaction solvent;
(ii) precipitating (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone (+)-dibenzoyl-D-tartrate represented by formula (5) by adding a poor solvent to a reaction solution of step (i), wherein the poor solvent is an ether-based solvent selected from diisopropyl ether, 1,2-dimethoxyethane, tetrahydrofuran, 2-methyltetrahydrofuran and cyclopentyl methyl ether;
(c) reacting (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone (+)-dibenzoyl-D-tartrate represented by formula (5):
or a solvate thereof with an organic base in a solvent to manufacture (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone represented by formula (6):
or a salt thereof or a solvate thereof, wherein the organic base is a tertiary amine; and
(d) reacting (R)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone represented by formula (6):
or a salt thereof or a solvate thereof with a compound of formula (7):
or a solvate thereof, in a solvent, to manufacture cis-(−)-flocinopiperidol represented by formula (I):
or a salt thereof or a solvate thereof, wherein M in formula (7) is lithium, sodium, or potassium.
2. The manufacturing method of claim 1 , wherein M in formula (7) used in step (d) is lithium.
3. The manufacturing method of claim 1 , wherein a compound of formula (I) or a solvate thereof is obtained in step (d) by extracting a product after a reduction reaction with an acidic aqueous solution and increasing the pH of the extraction solution.
4. The manufacturing method of claim 1 , wherein a compound of formula (I) or a solvate thereof is obtained in step (d) by extracting a product after a reduction reaction with an acidic aqueous solution and dripping the extraction solution into a basic aqueous solution.
5. The manufacturing method of claim 3 , wherein the pH of the acidic aqueous solution is 6.0 to 6.5 in step (d).
6. The manufacturing method of claim 3 , wherein the pH of the acidic aqueous solution is 6.0 in step (d).
7. The manufacturing method of claim 1 , wherein the solvent used in step (c) is an ether-based solvent.
8. The manufacturing method of claim 1 , wherein step (d) is performed using a base-neutralized product in a state of a solution without isolation in step (c).
9. The manufacturing method of claim 1 , wherein the reaction solvent in step (b) is at least one reaction solvent selected from an ester-based solvent, an ether-based solvent, an alcohol-based solvent, an amide-based solvent, a nitrile-based solvent, and an aromatic solvent.
10. The manufacturing method of claim 1 , wherein the reaction solvent used in step (b) is an alcohol-based solvent.
11. The manufacturing method of claim 1 , further comprising the following step (a) before step (b):
(a) reacting (+)-1-methyl-4-(2,4,6-trimethoxyphenyl) piperidine-3-ol represented by formula (1):
or a salt thereof or a solvate thereof with a compound represented by formula (2):
or a salt thereof or a solvate thereof and dialkyl sulfoxide to manufacture (+)-1-methyl-4-(2,4,6-trimethoxyphenyl)-3-piperidinone represented by formula (3):
or a salt thereof or a solvate thereof.
12. The manufacturing method of claim 11 , wherein Y in formula (2) used in step (a) is pyridine.
13. The manufacturing method of claim 11 , wherein the reaction in step (a) is performed at a temperature of −10° C. or higher.
14. The manufacturing method of claim 11 , wherein the reaction in step (a) is performed at a temperature from 0° C. to 30° C.